Implement encoding.Binary{Marshaler, Unmarshaler} #41
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These functions are simple wrappers around `Nat.SetBytes()` and `Nat.Bytes()`. For `Modulus`, we additionally call `precomputeValues()` in `UnmarshalBinary()`. `Int` returns `byte(i.sign) || i.nat.Bytes()`, so that the result is always at least one byte long. Only the LSB of of the first byte is actually used.
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These functions are simple wrappers around
Nat.SetBytes()andNat.Bytes().For
Modulus, we additionally callprecomputeValues()inUnmarshalBinary().Intreturnsbyte(i.sign) || i.nat.Bytes(), so that the result is always at least one byte long. Only the LSB of of the first byte is actually used.Also includes test to check that
MarshalBinary() -> UnmarshalBinary()returns the same result.